Okamiden: After Ice Room - Before Moon Cave 100 y.a.

okay so i just found out that i was missing an issun masterpiece 5 that was in agata forest and you need to send your partner across the water to get to the entrance where that issun masterpiece is. I probably forgot to go back to it after getting thunderstorm. But i already finished the ice room area and manpuku can't get to that area. am i screwed at 100%?anyway i searched for a 100% complete save file but the one I found was after the point of no return and before the last 3 boss fights, and didn't have weapon upgrades, its owner saying that it was less challenging and harder to get a good score for partner help. is there anyone here with a 100% save file just before the point of no return (entering moon cave after clearing ice room) ? thanks.

Hmmm.... The moon cave was that one after a long walk off the coast. I remember you had to meet someone there...

thanks for the reply.i guess i'll stick with that save file that i found on the net.mods, you could lock this now if you want to. thanks.

http://ds.gamespy.com/nintendo-ds/okamiden-chisaki-taiyou/guide/page_2.html